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Swansea's acting Senior Coroner Colin Philips has pushed the inquest back until August.
It's so police can continue with investigations into exactly how the mum-of-three died.
Meanwhile, Swansea Council has agreed on changes to the Kingsway.
The temporary measures will see all eastbound traffic along the road stopped.
Buses, coaches, taxis and the metro will all be diverted to other routes around the city centre.
Rob Stewart, Leader of the Council, said the TRO would be introduced as soon as possible:
"The purpose of the experimental TRO is to see and monitor the effects of diverting metro, bus and taxis services and to look at what changes to the road network might be necessary if we were to close Kingsway to eastbound traffic permanently."
He also said redevelopment work to Swansea City Centre is a top priority:
"As the city centre redevelopment gathers pace, new road layouts and traffic flows will be required - we will attempt to keep any disruption to a minimum.
“We will be attempting to create an environment that puts pedestrians at the heart of our new city, while making it easy for people to get in, out and around the area – successful urban planning is key to the success of our city. We hope to make some more announcements as soon as possible.”
Last year, a 20mph speed limit was enforced and extra signage for pedestrians was put up.
Sergeant Lucas was based at Llanishen police station in Cardiff, working around the villages of Llanishen, Rhiwbina and Thornhill.
A spokesman for the South Wales Police Federation, which represents officers in the force, says her death is devastating.